With the increasingly strict environmental protection policies, the quota limits for sewage treatment indicators in science and technology parks across the country have led to some industrial wastewater from science and technology parks and companies being unable to be discharged, and the definition of "zero discharge" of sewage has emerged in the industry. So, is there really "zero emissions"? Does "zero emissions" mean that only water needs to be recycled and zero emissions are sufficient? Today, let's take a look at the explanation of "zero discharge" of sewage.

Zero discharge of sewage

The theme activity refers to the unrestricted reduction of pollutants and electricity energy emissions until they reach zero. One is to manipulate the electricity, energy, and resource emissions that are inevitably caused during the production process to reduce them to zero; The second is to flexibly utilize these unavoidable electricity energy and resources, and ultimately solve the existence of non renewable energy and electricity energy.

Under the new environmental protection measures, the trend of "zero discharge" of sewage has been rising wave by wave, and new scientific research and application projects related to "zero discharge" of sewage have gradually been carried out in various fields across the country. Although it is common to see reports in China that sewage treatment technology is at the forefront of the world, are you really prepared for such a high fever of "zero emissions"?

1、 Where have all the waste gone?

For "zero discharge" of sewage, the country has established a definition. In the "Industrial Water Conservation Terminology" GB/T21534-2008, it is emphasized that "zero discharge" of sewage refers to the production and manufacturing of tap water system software by companies or behavioral entities to achieve no discharge of chemical wastewater. If there is no sewage discharge, where does the waste generated during the production process go?

Firstly, renewable resources are used again for production and manufacturing;

Secondly, use it as a raw material for other industries;

Thirdly, migrate to waste and carry out waste disposal.

At present, China has achieved zero discharge of sewage

1. Wastewater is treated through biochemical (or other traditional wastewater treatment processes) and then enters the ultrafiltration system for coarse filtration to solve the problem;

2. The water production from the ultrafiltration membrane is fed into the ultrafiltration membrane system software to carry out membrane separation technology solutions, and the liquid is extracted into the high-pressure membrane system software;

3. High pressure membrane cold water is discharged into the clean water collection tank, and concentrated water is fed into the volatilization system software;

4. The concentrated water from the high-pressure membrane enters the volatilization system software for evaporative crystallization, which solves the problem of "zero emissions";

5. Evaporated crystals are stored as solid waste and can be authorized to be entrusted to hazardous waste cores.

The concentration value of pollutants formed by "zero emissions" is very high, and at the same time, it also has strong solubility, which is difficult to interpret in the natural environment and can easily lead to secondary pollution. In recent years, in Japan and European and American countries, supercritical water air oxidation technology has been adopted for concentrated water containing high concentrations of organic chemical pollutants. The reaction standard is 400~600 ℃, and the working pressure is above 22Mpa, so that the water can reach the zero point and oxidize the pollutants into end products such as CO2 and H2O in a short period of seconds.

Whether it is resource recycling in production or the migration of pollutants into waste, the fact is that "waste" still exists and continues to be caused, and it is not the end device that solves the situation. Even if we choose strong air oxidation to convert pollutants into harmless chemical emissions, what we need to invest is a high energy consumption cost, which is still a form of transfer.

2、 High difficulty coefficient and increased cost

In theory, "zero emissions" can be achieved by solving the total number of pollutants caused by production and manufacturing, which is equivalent to the total amount of pollutants solved by the system software and carried by the goods, when the processing technology operates smoothly, and the water body can also be carried out in the production process to achieve "zero emissions". The implementation of "zero emissions" not only depends on the solution of the tail end sewage, but also on the integration of updates in the previous production process, reducing the emission of pollutants from the root, while improving the utilization rate of by-product resource recycling. At the same time, while improving the efficiency of the sewage solution system software, it is necessary to update and adjust the production process.

Apart from the constraints of technological level, the high cost of zero emission solutions is also one of the important limiting factors for Z. Whether it is traditional evaporation crystallization or the current trend of forward infiltration or nanofiltration membrane technology, the engineering cost is quite high. In addition, due to the standardization of zero emissions, companies must carry out hkkb solutions based on actual situations, which will invisibly increase the cost of solutions.

From the current situation in China, "zero discharge" of sewage has gradually been carried out. Through technological updates and renovations, some regions and manufacturers have already completed the reuse of many water sources, greatly reducing the discharge of pollutants, and even achieving "zero discharge" to a certain extent. Naturally, due to the significant differences in wastewater generated by different fields, it is necessary to consider the allocation of costs and fees based on different situations, using the intelligent management methods of modern technology. Considering comprehensive sewage treatment, scientifically and reasonably designing and coordinating production scheduling, we aim to expand and strengthen all green ecological technology parks.

3、 Bold attempt, careful promotion

Both in terms of technology and management methods, "zero discharge" of sewage is not yet mature enough. But the pursuit of perfection, higher efficiency, and economic development in sewage treatment methods is a clear prescription. Zero emissions is an unforgettable attempt by pioneering sewage treatment companies to better address higher air quality standards.

Although the difficulty level is high, it has been continuously concerned by countries around the world from beginning to end. Based on overseas work experience, the current policy has a very prominent guiding effect on promoting zero emissions. The fundamental reason for the implementation of Z's current policy of zero discharge of sewage in the United States is that chemical wastewater seriously affects the water bodies of river embankments, thus forcing the implementation of the current policy of zero discharge. At the same time, strengthening the control of the natural environment and improving the charging standards and regulations for tap water and sewage treatment are also due to current policy requirements that require mandatory implementation.

专业水处理的疑难问题，产品选型问题，可以单击下面的微信二维码电话联系贺工在线指导，长按微信二维码可自动识别添加贺工微信沟通解决您的疑难问题